using Return 0; or not. whats the difference actually?

Question

When i use return 0; the output is just as same as when i dont use return 0;
then why we should use it?

Answer 1

The standard says that it is OK, to omit the return statement for main().

http://www.stroustrup.com/bs_faq2.html#void-main

Answer 2

If a function is declared to return a value and fails to do so, the result is undefined behavior (in C++) When we don't declare return 0. One possible result is seeming to work.

As an aside, in C, you wouldn't actually have undefined behavior -- in C, you get undefined behavior only if you try to use the return value, and the function didn't specify a value to return.

Answer 3

We return 0 in the main function to indicate to the environment the fact that the program worked as expected. You can return a non-zero value to indicate an error.

Generally, if you omit it, the compiler will append it at the end of the main function.

Answer 4

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